121220111222222 has 16 divisors (see below), whose sum is σ = 183880129140720. Its totient is φ = 59926786151232.

The previous prime is 121220111222213. The next prime is 121220111222227. The reversal of 121220111222222 is 222222111022121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220111222227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8083988 + ... + 17543975.

It is an arithmetic number, because the mean of its divisors is an integer number (11492508071295).

Almost surely, 2^{121220111222222} is an apocalyptic number.

121220111222222 is a deficient number, since it is larger than the sum of its proper divisors (62660017918498).

121220111222222 is a wasteful number, since it uses less digits than its factorization.

121220111222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25654627.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 121220111222222 its reverse (222222111022121), we get a palindrome (343442222244343).

The spelling of 121220111222222 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-two".